To shore up your new found shooting skills, you might look for an NRA Basic Pistol Class in your area. They are not that expensive, but will teach you a lot about basic gun handling. . .some your more "experienced" friends don't know.

+100

Really, even if you think you know (from military or other training) this will prove and strengthen it.

And maybe you'll learn about other branches of fun. The lady who taught the course my wife and I took was also recruiting people to try IPSC ("action shooting") which is outstanding fun. I wound up helping her teach the course for awhile as well as branching into IPSC and then being the club range officer for awhile.